ux/Showdown.js

[roojs1] / ux / Showdown.js

//
 /**
 * marked - a markdown parser
 * Copyright (c) 2011-2014, Christopher Jeffrey. (MIT Licensed)
 * https://github.com/chjj/marked
 */


//
// Showdown usage:
// 
//   alert( Roo.ux.Showdown.toHtml("Markdown *rocks*.") );
// 
// Note: move the sample code to the bottom of this
// file before uncommenting it.
//


//
// Showdown namespace
//
Roo.namespace('Roo.ux'); 
Roo.ux.Showdown = {};
Roo.ux.Showdown.toHtml = function(text) {
    var c = new Roo.ux.Showdown.converter();
    return c.makeHtml(text);
};
//
// converter
//
// Wraps all "globals" so that the only thing
// exposed is makeHtml().
//
(function() {
    
    /**
     * Block-Level Grammar
     */
    
    var block = {
      newline: /^\n+/,
      code: /^( {4}[^\n]+\n*)+/,
      fences: noop,
      hr: /^( *[-*_]){3,} *(?:\n+|$)/,
      heading: /^ *(#{1,6}) *([^\n]+?) *#* *(?:\n+|$)/,
      nptable: noop,
      lheading: /^([^\n]+)\n *(=|-){2,} *(?:\n+|$)/,
      blockquote: /^( *>[^\n]+(\n(?!def)[^\n]+)*\n*)+/,
      list: /^( *)(bull) [\s\S]+?(?:hr|def|\n{2,}(?! )(?!\1bull )\n*|\s*$)/,
      html: /^ *(?:comment *(?:\n|\s*$)|closed *(?:\n{2,}|\s*$)|closing *(?:\n{2,}|\s*$))/,
      def: /^ *\[([^\]]+)\]: *<?([^\s>]+)>?(?: +["(]([^\n]+)[")])? *(?:\n+|$)/,
      table: noop,
      paragraph: /^((?:[^\n]+\n?(?!hr|heading|lheading|blockquote|tag|def))+)\n*/,
      text: /^[^\n]+/
    };
    
    block.bullet = /(?:[*+-]|\d+\.)/;
    block.item = /^( *)(bull) [^\n]*(?:\n(?!\1bull )[^\n]*)*/;
    block.item = replace(block.item, 'gm')
      (/bull/g, block.bullet)
      ();
    
    block.list = replace(block.list)
      (/bull/g, block.bullet)
      ('hr', '\\n+(?=\\1?(?:[-*_] *){3,}(?:\\n+|$))')
      ('def', '\\n+(?=' + block.def.source + ')')
      ();
    
    block.blockquote = replace(block.blockquote)
      ('def', block.def)
      ();
    
    block._tag = '(?!(?:'
      + 'a|em|strong|small|s|cite|q|dfn|abbr|data|time|code'
      + '|var|samp|kbd|sub|sup|i|b|u|mark|ruby|rt|rp|bdi|bdo'
      + '|span|br|wbr|ins|del|img)\\b)\\w+(?!:/|[^\\w\\s@]*@)\\b';
    
    block.html = replace(block.html)
      ('comment', /<!--[\s\S]*?-->/)
      ('closed', /<(tag)[\s\S]+?<\/\1>/)
      ('closing', /<tag(?:"[^"]*"|'[^']*'|[^'">])*?>/)
      (/tag/g, block._tag)
      ();
    
    block.paragraph = replace(block.paragraph)
      ('hr', block.hr)
      ('heading', block.heading)
      ('lheading', block.lheading)
      ('blockquote', block.blockquote)
      ('tag', '<' + block._tag)
      ('def', block.def)
      ();
    
    /**
     * Normal Block Grammar
     */
    
    block.normal = merge({}, block);
    
    /**
     * GFM Block Grammar
     */
    
    block.gfm = merge({}, block.normal, {
      fences: /^ *(`{3,}|~{3,})[ \.]*(\S+)? *\n([\s\S]*?)\s*\1 *(?:\n+|$)/,
      paragraph: /^/,
      heading: /^ *(#{1,6}) +([^\n]+?) *#* *(?:\n+|$)/
    });
    
    block.gfm.paragraph = replace(block.paragraph)
      ('(?!', '(?!'
        + block.gfm.fences.source.replace('\\1', '\\2') + '|'
        + block.list.source.replace('\\1', '\\3') + '|')
      ();
    
    /**
     * GFM + Tables Block Grammar
     */
    
    block.tables = merge({}, block.gfm, {
      nptable: /^ *(\S.*\|.*)\n *([-:]+ *\|[-| :]*)\n((?:.*\|.*(?:\n|$))*)\n*/,
      table: /^ *\|(.+)\n *\|( *[-:]+[-| :]*)\n((?: *\|.*(?:\n|$))*)\n*/
    });
    
    /**
     * Block Lexer
     */
    
    function Lexer(options) {
      this.tokens = [];
      this.tokens.links = {};
      this.options = options || marked.defaults;
      this.rules = block.normal;
    
      if (this.options.gfm) {
        if (this.options.tables) {
          this.rules = block.tables;
        } else {
          this.rules = block.gfm;
        }
      }
    }
    
    /**
     * Expose Block Rules
     */
    
    Lexer.rules = block;
    
    /**
     * Static Lex Method
     */
    
    Lexer.lex = function(src, options) {
      var lexer = new Lexer(options);
      return lexer.lex(src);
    };
    
    /**
     * Preprocessing
     */
    
    Lexer.prototype.lex = function(src) {
      src = src
        .replace(/\r\n|\r/g, '\n')
        .replace(/\t/g, '    ')
        .replace(/\u00a0/g, ' ')
        .replace(/\u2424/g, '\n');
    
      return this.token(src, true);
    };
    
    /**
     * Lexing
     */
    
    Lexer.prototype.token = function(src, top, bq) {
      var src = src.replace(/^ +$/gm, '')
        , next
        , loose
        , cap
        , bull
        , b
        , item
        , space
        , i
        , l;
    
      while (src) {
        // newline
        if (cap = this.rules.newline.exec(src)) {
          src = src.substring(cap[0].length);
          if (cap[0].length > 1) {
            this.tokens.push({
              type: 'space'
            });
          }
        }
    
        // code
        if (cap = this.rules.code.exec(src)) {
          src = src.substring(cap[0].length);
          cap = cap[0].replace(/^ {4}/gm, '');
          this.tokens.push({
            type: 'code',
            text: !this.options.pedantic
              ? cap.replace(/\n+$/, '')
              : cap
          });
          continue;
        }
    
        // fences (gfm)
        if (cap = this.rules.fences.exec(src)) {
          src = src.substring(cap[0].length);
          this.tokens.push({
            type: 'code',
            lang: cap[2],
            text: cap[3] || ''
          });
          continue;
        }
    
        // heading
        if (cap = this.rules.heading.exec(src)) {
          src = src.substring(cap[0].length);
          this.tokens.push({
            type: 'heading',
            depth: cap[1].length,
            text: cap[2]
          });
          continue;
        }
    
        // table no leading pipe (gfm)
        if (top && (cap = this.rules.nptable.exec(src))) {
          src = src.substring(cap[0].length);
    
          item = {
            type: 'table',
            header: cap[1].replace(/^ *| *\| *$/g, '').split(/ *\| */),
            align: cap[2].replace(/^ *|\| *$/g, '').split(/ *\| */),
            cells: cap[3].replace(/\n$/, '').split('\n')
          };
    
          for (i = 0; i < item.align.length; i++) {
            if (/^ *-+: *$/.test(item.align[i])) {
              item.align[i] = 'right';
            } else if (/^ *:-+: *$/.test(item.align[i])) {
              item.align[i] = 'center';
            } else if (/^ *:-+ *$/.test(item.align[i])) {
              item.align[i] = 'left';
            } else {
              item.align[i] = null;
            }
          }
    
          for (i = 0; i < item.cells.length; i++) {
            item.cells[i] = item.cells[i].split(/ *\| */);
          }
    
          this.tokens.push(item);
    
          continue;
        }
    
        // lheading
        if (cap = this.rules.lheading.exec(src)) {
          src = src.substring(cap[0].length);
          this.tokens.push({
            type: 'heading',
            depth: cap[2] === '=' ? 1 : 2,
            text: cap[1]
          });
          continue;
        }
    
        // hr
        if (cap = this.rules.hr.exec(src)) {
          src = src.substring(cap[0].length);
          this.tokens.push({
            type: 'hr'
          });
          continue;
        }
    
        // blockquote
        if (cap = this.rules.blockquote.exec(src)) {
          src = src.substring(cap[0].length);
    
          this.tokens.push({
            type: 'blockquote_start'
          });
    
          cap = cap[0].replace(/^ *> ?/gm, '');
    
          // Pass `top` to keep the current
          // "toplevel" state. This is exactly
          // how markdown.pl works.
          this.token(cap, top, true);
    
          this.tokens.push({
            type: 'blockquote_end'
          });
    
          continue;
        }
    
        // list
        if (cap = this.rules.list.exec(src)) {
          src = src.substring(cap[0].length);
          bull = cap[2];
    
          this.tokens.push({
            type: 'list_start',
            ordered: bull.length > 1
          });
    
          // Get each top-level item.
          cap = cap[0].match(this.rules.item);
    
          next = false;
          l = cap.length;
          i = 0;
    
          for (; i < l; i++) {
            item = cap[i];
    
            // Remove the list item's bullet
            // so it is seen as the next token.
            space = item.length;
            item = item.replace(/^ *([*+-]|\d+\.) +/, '');
    
            // Outdent whatever the
            // list item contains. Hacky.
            if (~item.indexOf('\n ')) {
              space -= item.length;
              item = !this.options.pedantic
                ? item.replace(new RegExp('^ {1,' + space + '}', 'gm'), '')
                : item.replace(/^ {1,4}/gm, '');
            }
    
            // Determine whether the next list item belongs here.
            // Backpedal if it does not belong in this list.
            if (this.options.smartLists && i !== l - 1) {
              b = block.bullet.exec(cap[i + 1])[0];
              if (bull !== b && !(bull.length > 1 && b.length > 1)) {
                src = cap.slice(i + 1).join('\n') + src;
                i = l - 1;
              }
            }
    
            // Determine whether item is loose or not.
            // Use: /(^|\n)(?! )[^\n]+\n\n(?!\s*$)/
            // for discount behavior.
            loose = next || /\n\n(?!\s*$)/.test(item);
            if (i !== l - 1) {
              next = item.charAt(item.length - 1) === '\n';
              if (!loose) loose = next;
            }
    
            this.tokens.push({
              type: loose
                ? 'loose_item_start'
                : 'list_item_start'
            });
    
            // Recurse.
            this.token(item, false, bq);
    
            this.tokens.push({
              type: 'list_item_end'
            });
          }
    
          this.tokens.push({
            type: 'list_end'
          });
    
          continue;
        }
    
        // html
        if (cap = this.rules.html.exec(src)) {
          src = src.substring(cap[0].length);
          this.tokens.push({
            type: this.options.sanitize
              ? 'paragraph'
              : 'html',
            pre: !this.options.sanitizer
              && (cap[1] === 'pre' || cap[1] === 'script' || cap[1] === 'style'),
            text: cap[0]
          });
          continue;
        }
    
        // def
        if ((!bq && top) && (cap = this.rules.def.exec(src))) {
          src = src.substring(cap[0].length);
          this.tokens.links[cap[1].toLowerCase()] = {
            href: cap[2],
            title: cap[3]
          };
          continue;
        }
    
        // table (gfm)
        if (top && (cap = this.rules.table.exec(src))) {
          src = src.substring(cap[0].length);
    
          item = {
            type: 'table',
            header: cap[1].replace(/^ *| *\| *$/g, '').split(/ *\| */),
            align: cap[2].replace(/^ *|\| *$/g, '').split(/ *\| */),
            cells: cap[3].replace(/(?: *\| *)?\n$/, '').split('\n')
          };
    
          for (i = 0; i < item.align.length; i++) {
            if (/^ *-+: *$/.test(item.align[i])) {
              item.align[i] = 'right';
            } else if (/^ *:-+: *$/.test(item.align[i])) {
              item.align[i] = 'center';
            } else if (/^ *:-+ *$/.test(item.align[i])) {
              item.align[i] = 'left';
            } else {
              item.align[i] = null;
            }
          }
    
          for (i = 0; i < item.cells.length; i++) {
            item.cells[i] = item.cells[i]
              .replace(/^ *\| *| *\| *$/g, '')
              .split(/ *\| */);
          }
    
          this.tokens.push(item);
    
          continue;
        }
    
        // top-level paragraph
        if (top && (cap = this.rules.paragraph.exec(src))) {
          src = src.substring(cap[0].length);
          this.tokens.push({
            type: 'paragraph',
            text: cap[1].charAt(cap[1].length - 1) === '\n'
              ? cap[1].slice(0, -1)
              : cap[1]
          });
          continue;
        }
    
        // text
        if (cap = this.rules.text.exec(src)) {
          // Top-level should never reach here.
          src = src.substring(cap[0].length);
          this.tokens.push({
            type: 'text',
            text: cap[0]
          });
          continue;
        }
    
        if (src) {
          throw new
            Error('Infinite loop on byte: ' + src.charCodeAt(0));
        }
      }
    
      return this.tokens;
    };
    
    /**
     * Inline-Level Grammar
     */
    
    var inline = {
      escape: /^\\([\\`*{}\[\]()#+\-.!_>])/,
      autolink: /^<([^ >]+(@|:\/)[^ >]+)>/,
      url: noop,
      tag: /^<!--[\s\S]*?-->|^<\/?\w+(?:"[^"]*"|'[^']*'|[^'">])*?>/,
      link: /^!?\[(inside)\]\(href\)/,
      reflink: /^!?\[(inside)\]\s*\[([^\]]*)\]/,
      nolink: /^!?\[((?:\[[^\]]*\]|[^\[\]])*)\]/,
      strong: /^__([\s\S]+?)__(?!_)|^\*\*([\s\S]+?)\*\*(?!\*)/,
      em: /^\b_((?:[^_]|__)+?)_\b|^\*((?:\*\*|[\s\S])+?)\*(?!\*)/,
      code: /^(`+)\s*([\s\S]*?[^`])\s*\1(?!`)/,
      br: /^ {2,}\n(?!\s*$)/,
      del: noop,
      text: /^[\s\S]+?(?=[\\<!\[_*`]| {2,}\n|$)/
    };
    
    inline._inside = /(?:\[[^\]]*\]|[^\[\]]|\](?=[^\[]*\]))*/;
    inline._href = /\s*<?([\s\S]*?)>?(?:\s+['"]([\s\S]*?)['"])?\s*/;
    
    inline.link = replace(inline.link)
      ('inside', inline._inside)
      ('href', inline._href)
      ();
    
    inline.reflink = replace(inline.reflink)
      ('inside', inline._inside)
      ();
    
    /**
     * Normal Inline Grammar
     */
    
    inline.normal = merge({}, inline);
    
    /**
     * Pedantic Inline Grammar
     */
    
    inline.pedantic = merge({}, inline.normal, {
      strong: /^__(?=\S)([\s\S]*?\S)__(?!_)|^\*\*(?=\S)([\s\S]*?\S)\*\*(?!\*)/,
      em: /^_(?=\S)([\s\S]*?\S)_(?!_)|^\*(?=\S)([\s\S]*?\S)\*(?!\*)/
    });
    
    /**
     * GFM Inline Grammar
     */
    
    inline.gfm = merge({}, inline.normal, {
      escape: replace(inline.escape)('])', '~|])')(),
      url: /^(https?:\/\/[^\s<]+[^<.,:;"')\]\s])/,
      del: /^~~(?=\S)([\s\S]*?\S)~~/,
      text: replace(inline.text)
        (']|', '~]|')
        ('|', '|https?://|')
        ()
    });
    
    /**
     * GFM + Line Breaks Inline Grammar
     */
    
    inline.breaks = merge({}, inline.gfm, {
      br: replace(inline.br)('{2,}', '*')(),
      text: replace(inline.gfm.text)('{2,}', '*')()
    });
    
    /**
     * Inline Lexer & Compiler
     */
    
    function InlineLexer(links, options) {
      this.options = options || marked.defaults;
      this.links = links;
      this.rules = inline.normal;
      this.renderer = this.options.renderer || new Renderer;
      this.renderer.options = this.options;
    
      if (!this.links) {
        throw new
          Error('Tokens array requires a `links` property.');
      }
    
      if (this.options.gfm) {
        if (this.options.breaks) {
          this.rules = inline.breaks;
        } else {
          this.rules = inline.gfm;
        }
      } else if (this.options.pedantic) {
        this.rules = inline.pedantic;
      }
    }
    
    /**
     * Expose Inline Rules
     */
    
    InlineLexer.rules = inline;
    
    /**
     * Static Lexing/Compiling Method
     */
    
    InlineLexer.output = function(src, links, options) {
      var inline = new InlineLexer(links, options);
      return inline.output(src);
    };
    
    /**
     * Lexing/Compiling
     */
    
    InlineLexer.prototype.output = function(src) {
      var out = ''
        , link
        , text
        , href
        , cap;
    
      while (src) {
        // escape
        if (cap = this.rules.escape.exec(src)) {
          src = src.substring(cap[0].length);
          out += cap[1];
          continue;
        }
    
        // autolink
        if (cap = this.rules.autolink.exec(src)) {
          src = src.substring(cap[0].length);
          if (cap[2] === '@') {
            text = cap[1].charAt(6) === ':'
              ? this.mangle(cap[1].substring(7))
              : this.mangle(cap[1]);
            href = this.mangle('mailto:') + text;
          } else {
            text = escape(cap[1]);
            href = text;
          }
          out += this.renderer.link(href, null, text);
          continue;
        }
    
        // url (gfm)
        if (!this.inLink && (cap = this.rules.url.exec(src))) {
          src = src.substring(cap[0].length);
          text = escape(cap[1]);
          href = text;
          out += this.renderer.link(href, null, text);
          continue;
        }
    
        // tag
        if (cap = this.rules.tag.exec(src)) {
          if (!this.inLink && /^<a /i.test(cap[0])) {
            this.inLink = true;
          } else if (this.inLink && /^<\/a>/i.test(cap[0])) {
            this.inLink = false;
          }
          src = src.substring(cap[0].length);
          out += this.options.sanitize
            ? this.options.sanitizer
              ? this.options.sanitizer(cap[0])
              : escape(cap[0])
            : cap[0]
          continue;
        }
    
        // link
        if (cap = this.rules.link.exec(src)) {
          src = src.substring(cap[0].length);
          this.inLink = true;
          out += this.outputLink(cap, {
            href: cap[2],
            title: cap[3]
          });
          this.inLink = false;
          continue;
        }
    
        // reflink, nolink
        if ((cap = this.rules.reflink.exec(src))
            || (cap = this.rules.nolink.exec(src))) {
          src = src.substring(cap[0].length);
          link = (cap[2] || cap[1]).replace(/\s+/g, ' ');
          link = this.links[link.toLowerCase()];
          if (!link || !link.href) {
            out += cap[0].charAt(0);
            src = cap[0].substring(1) + src;
            continue;
          }
          this.inLink = true;
          out += this.outputLink(cap, link);
          this.inLink = false;
          continue;
        }
    
        // strong
        if (cap = this.rules.strong.exec(src)) {
          src = src.substring(cap[0].length);
          out += this.renderer.strong(this.output(cap[2] || cap[1]));
          continue;
        }
    
        // em
        if (cap = this.rules.em.exec(src)) {
          src = src.substring(cap[0].length);
          out += this.renderer.em(this.output(cap[2] || cap[1]));
          continue;
        }
    
        // code
        if (cap = this.rules.code.exec(src)) {
          src = src.substring(cap[0].length);
          out += this.renderer.codespan(escape(cap[2], true));
          continue;
        }
    
        // br
        if (cap = this.rules.br.exec(src)) {
          src = src.substring(cap[0].length);
          out += this.renderer.br();
          continue;
        }
    
        // del (gfm)
        if (cap = this.rules.del.exec(src)) {
          src = src.substring(cap[0].length);
          out += this.renderer.del(this.output(cap[1]));
          continue;
        }
    
        // text
        if (cap = this.rules.text.exec(src)) {
          src = src.substring(cap[0].length);
          out += this.renderer.text(escape(this.smartypants(cap[0])));
          continue;
        }
    
        if (src) {
          throw new
            Error('Infinite loop on byte: ' + src.charCodeAt(0));
        }
      }
    
      return out;
    };
    
    /**
     * Compile Link
     */
    
    InlineLexer.prototype.outputLink = function(cap, link) {
      var href = escape(link.href)
        , title = link.title ? escape(link.title) : null;
    
      return cap[0].charAt(0) !== '!'
        ? this.renderer.link(href, title, this.output(cap[1]))
        : this.renderer.image(href, title, escape(cap[1]));
    };
    
    /**
     * Smartypants Transformations
     */
    
    InlineLexer.prototype.smartypants = function(text) {
      if (!this.options.smartypants) return text;
      return text
        // em-dashes
        .replace(/---/g, '\u2014')
        // en-dashes
        .replace(/--/g, '\u2013')
        // opening singles
        .replace(/(^|[-\u2014/(\[{"\s])'/g, '$1\u2018')
        // closing singles & apostrophes
        .replace(/'/g, '\u2019')
        // opening doubles
        .replace(/(^|[-\u2014/(\[{\u2018\s])"/g, '$1\u201c')
        // closing doubles
        .replace(/"/g, '\u201d')
        // ellipses
        .replace(/\.{3}/g, '\u2026');
    };
    
    /**
     * Mangle Links
     */
    
    InlineLexer.prototype.mangle = function(text) {
      if (!this.options.mangle) return text;
      var out = ''
        , l = text.length
        , i = 0
        , ch;
    
      for (; i < l; i++) {
        ch = text.charCodeAt(i);
        if (Math.random() > 0.5) {
          ch = 'x' + ch.toString(16);
        }
        out += '&#' + ch + ';';
      }
    
      return out;
    };
    
    /**
     * Renderer
     */
    
    function Renderer(options) {
      this.options = options || {};
    }
    
    Renderer.prototype.code = function(code, lang, escaped) {
      if (this.options.highlight) {
        var out = this.options.highlight(code, lang);
        if (out != null && out !== code) {
          escaped = true;
          code = out;
        }
      }
    
      if (!lang) {
        return '<pre><code>'
          + (escaped ? code : escape(code, true))
          + '\n</code></pre>';
      }
    
      return '<pre><code class="'
        + this.options.langPrefix
        + escape(lang, true)
        + '">'
        + (escaped ? code : escape(code, true))
        + '\n</code></pre>\n';
    };
    
    Renderer.prototype.blockquote = function(quote) {
      return '<blockquote>\n' + quote + '</blockquote>\n';
    };
    
    Renderer.prototype.html = function(html) {
      return html;
    };
    
    Renderer.prototype.heading = function(text, level, raw) {
      return '<h'
        + level
        + ' id="'
        + this.options.headerPrefix
        + raw.toLowerCase().replace(/[^\w]+/g, '-')
        + '">'
        + text
        + '</h'
        + level
        + '>\n';
    };
    
    Renderer.prototype.hr = function() {
      return this.options.xhtml ? '<hr/>\n' : '<hr>\n';
    };
    
    Renderer.prototype.list = function(body, ordered) {
      var type = ordered ? 'ol' : 'ul';
      return '<' + type + '>\n' + body + '</' + type + '>\n';
    };
    
    Renderer.prototype.listitem = function(text) {
      return '<li>' + text + '</li>\n';
    };
    
    Renderer.prototype.paragraph = function(text) {
      return '<p>' + text + '</p>\n';
    };
    
    Renderer.prototype.table = function(header, body) {
      return '<table>\n'
        + '<thead>\n'
        + header
        + '</thead>\n'
        + '<tbody>\n'
        + body
        + '</tbody>\n'
        + '</table>\n';
    };
    
    Renderer.prototype.tablerow = function(content) {
      return '<tr>\n' + content + '</tr>\n';
    };
    
    Renderer.prototype.tablecell = function(content, flags) {
      var type = flags.header ? 'th' : 'td';
      var tag = flags.align
        ? '<' + type + ' style="text-align:' + flags.align + '">'
        : '<' + type + '>';
      return tag + content + '</' + type + '>\n';
    };
    
    // span level renderer
    Renderer.prototype.strong = function(text) {
      return '<strong>' + text + '</strong>';
    };
    
    Renderer.prototype.em = function(text) {
      return '<em>' + text + '</em>';
    };
    
    Renderer.prototype.codespan = function(text) {
      return '<code>' + text + '</code>';
    };
    
    Renderer.prototype.br = function() {
      return this.options.xhtml ? '<br/>' : '<br>';
    };
    
    Renderer.prototype.del = function(text) {
      return '<del>' + text + '</del>';
    };
    
    Renderer.prototype.link = function(href, title, text) {
      if (this.options.sanitize) {
        try {
          var prot = decodeURIComponent(unescape(href))
            .replace(/[^\w:]/g, '')
            .toLowerCase();
        } catch (e) {
          return '';
        }
        if (prot.indexOf('javascript:') === 0 || prot.indexOf('vbscript:') === 0) {
          return '';
        }
      }
      var out = '<a href="' + href + '"';
      if (title) {
        out += ' title="' + title + '"';
      }
      out += '>' + text + '</a>';
      return out;
    };
    
    Renderer.prototype.image = function(href, title, text) {
      var out = '<img src="' + href + '" alt="' + text + '"';
      if (title) {
        out += ' title="' + title + '"';
      }
      out += this.options.xhtml ? '/>' : '>';
      return out;
    };
    
    Renderer.prototype.text = function(text) {
      return text;
    };
    
    /**
     * Parsing & Compiling
     */
    
    function Parser(options) {
      this.tokens = [];
      this.token = null;
      this.options = options || marked.defaults;
      this.options.renderer = this.options.renderer || new Renderer;
      this.renderer = this.options.renderer;
      this.renderer.options = this.options;
    }
    
    /**
     * Static Parse Method
     */
    
    Parser.parse = function(src, options, renderer) {
      var parser = new Parser(options, renderer);
      return parser.parse(src);
    };
    
    /**
     * Parse Loop
     */
    
    Parser.prototype.parse = function(src) {
      this.inline = new InlineLexer(src.links, this.options, this.renderer);
      this.tokens = src.reverse();
    
      var out = '';
      while (this.next()) {
        out += this.tok();
      }
    
      return out;
    };
    
    /**
     * Next Token
     */
    
    Parser.prototype.next = function() {
      return this.token = this.tokens.pop();
    };
    
    /**
     * Preview Next Token
     */
    
    Parser.prototype.peek = function() {
      return this.tokens[this.tokens.length - 1] || 0;
    };
    
    /**
     * Parse Text Tokens
     */
    
    Parser.prototype.parseText = function() {
      var body = this.token.text;
    
      while (this.peek().type === 'text') {
        body += '\n' + this.next().text;
      }
    
      return this.inline.output(body);
    };
    
    /**
     * Parse Current Token
     */
    
    Parser.prototype.tok = function() {
      switch (this.token.type) {
        case 'space': {
          return '';
        }
        case 'hr': {
          return this.renderer.hr();
        }
        case 'heading': {
          return this.renderer.heading(
            this.inline.output(this.token.text),
            this.token.depth,
            this.token.text);
        }
        case 'code': {
          return this.renderer.code(this.token.text,
            this.token.lang,
            this.token.escaped);
        }
        case 'table': {
          var header = ''
            , body = ''
            , i
            , row
            , cell
            , flags
            , j;
    
          // header
          cell = '';
          for (i = 0; i < this.token.header.length; i++) {
            flags = { header: true, align: this.token.align[i] };
            cell += this.renderer.tablecell(
              this.inline.output(this.token.header[i]),
              { header: true, align: this.token.align[i] }
            );
          }
          header += this.renderer.tablerow(cell);
    
          for (i = 0; i < this.token.cells.length; i++) {
            row = this.token.cells[i];
    
            cell = '';
            for (j = 0; j < row.length; j++) {
              cell += this.renderer.tablecell(
                this.inline.output(row[j]),
                { header: false, align: this.token.align[j] }
              );
            }
    
            body += this.renderer.tablerow(cell);
          }
          return this.renderer.table(header, body);
        }
        case 'blockquote_start': {
          var body = '';
    
          while (this.next().type !== 'blockquote_end') {
            body += this.tok();
          }
    
          return this.renderer.blockquote(body);
        }
        case 'list_start': {
          var body = ''
            , ordered = this.token.ordered;
    
          while (this.next().type !== 'list_end') {
            body += this.tok();
          }
    
          return this.renderer.list(body, ordered);
        }
        case 'list_item_start': {
          var body = '';
    
          while (this.next().type !== 'list_item_end') {
            body += this.token.type === 'text'
              ? this.parseText()
              : this.tok();
          }
    
          return this.renderer.listitem(body);
        }
        case 'loose_item_start': {
          var body = '';
    
          while (this.next().type !== 'list_item_end') {
            body += this.tok();
          }
    
          return this.renderer.listitem(body);
        }
        case 'html': {
          var html = !this.token.pre && !this.options.pedantic
            ? this.inline.output(this.token.text)
            : this.token.text;
          return this.renderer.html(html);
        }
        case 'paragraph': {
          return this.renderer.paragraph(this.inline.output(this.token.text));
        }
        case 'text': {
          return this.renderer.paragraph(this.parseText());
        }
      }
    };
    
    /**
     * Helpers
     */
    
    function escape(html, encode) {
      return html
        .replace(!encode ? /&(?!#?\w+;)/g : /&/g, '&amp;')
        .replace(/</g, '&lt;')
        .replace(/>/g, '&gt;')
        .replace(/"/g, '&quot;')
        .replace(/'/g, '&#39;');
    }
    
    function unescape(html) {
        // explicitly match decimal, hex, and named HTML entities 
      return html.replace(/&(#(?:\d+)|(?:#x[0-9A-Fa-f]+)|(?:\w+));?/g, function(_, n) {
        n = n.toLowerCase();
        if (n === 'colon') return ':';
        if (n.charAt(0) === '#') {
          return n.charAt(1) === 'x'
            ? String.fromCharCode(parseInt(n.substring(2), 16))
            : String.fromCharCode(+n.substring(1));
        }
        return '';
      });
    }
    
    function replace(regex, opt) {
      regex = regex.source;
      opt = opt || '';
      return function self(name, val) {
        if (!name) return new RegExp(regex, opt);
        val = val.source || val;
        val = val.replace(/(^|[^\[])\^/g, '$1');
        regex = regex.replace(name, val);
        return self;
      };
    }
    
    function noop() {}
    noop.exec = noop;
    
    function merge(obj) {
      var i = 1
        , target
        , key;
    
      for (; i < arguments.length; i++) {
        target = arguments[i];
        for (key in target) {
          if (Object.prototype.hasOwnProperty.call(target, key)) {
            obj[key] = target[key];
          }
        }
      }
    
      return obj;
    }
    
    
    /**
     * Marked
     */
    
    function marked(src, opt, callback) {
      if (callback || typeof opt === 'function') {
        if (!callback) {
          callback = opt;
          opt = null;
        }
    
        opt = merge({}, marked.defaults, opt || {});
    
        var highlight = opt.highlight
          , tokens
          , pending
          , i = 0;
    
        try {
          tokens = Lexer.lex(src, opt)
        } catch (e) {
          return callback(e);
        }
    
        pending = tokens.length;
    
        var done = function(err) {
          if (err) {
            opt.highlight = highlight;
            return callback(err);
          }
    
          var out;
    
          try {
            out = Parser.parse(tokens, opt);
          } catch (e) {
            err = e;
          }
    
          opt.highlight = highlight;
    
          return err
            ? callback(err)
            : callback(null, out);
        };
    
        if (!highlight || highlight.length < 3) {
          return done();
        }
    
        delete opt.highlight;
    
        if (!pending) return done();
    
        for (; i < tokens.length; i++) {
          (function(token) {
            if (token.type !== 'code') {
              return --pending || done();
            }
            return highlight(token.text, token.lang, function(err, code) {
              if (err) return done(err);
              if (code == null || code === token.text) {
                return --pending || done();
              }
              token.text = code;
              token.escaped = true;
              --pending || done();
            });
          })(tokens[i]);
        }
    
        return;
      }
      try {
        if (opt) opt = merge({}, marked.defaults, opt);
        return Parser.parse(Lexer.lex(src, opt), opt);
      } catch (e) {
        e.message += '\nPlease report this to https://github.com/chjj/marked.';
        if ((opt || marked.defaults).silent) {
          return '<p>An error occured:</p><pre>'
            + escape(e.message + '', true)
            + '</pre>';
        }
        throw e;
      }
    }
    
    /**
     * Options
     */
    
    marked.options =
    marked.setOptions = function(opt) {
      merge(marked.defaults, opt);
      return marked;
    };
    
    marked.defaults = {
      gfm: true,
      tables: true,
      breaks: false,
      pedantic: false,
      sanitize: false,
      sanitizer: null,
      mangle: true,
      smartLists: false,
      silent: false,
      highlight: null,
      langPrefix: 'lang-',
      smartypants: false,
      headerPrefix: '',
      renderer: new Renderer,
      xhtml: false
    };
    
    /**
     * Expose
     */
    
    marked.Parser = Parser;
    marked.parser = Parser.parse;
    
    marked.Renderer = Renderer;
    
    marked.Lexer = Lexer;
    marked.lexer = Lexer.lex;
    
    marked.InlineLexer = InlineLexer;
    marked.inlineLexer = InlineLexer.output;
    
    marked.parse = marked;
    
    Roo.ux.Showdown.marked = marked;

})();